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I want to use address trace mode on the 56321 and 56303 so that I can watch internal Pmem fetches with a logic analyzer. I would like to use the logic analyzer in a mode where it is clocked from the DSP. Is there any signal from the DSP that I could use for this?

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--- In motoroladsp@y..., "rathben" <rathben@y...> wrote: > I want to use address trace mode on the 56321 and 56303 so that I can > watch internal Pmem fetches with a logic analyzer. I would like to > use the logic analyzer in a mode where it is clocked from the DSP. Is > there any signal from the DSP that I could use for this? (This is for the benefit of the group, since the answer was provided offline.) Take a look at pages 29 (1-7), 168 (7-36), and 182 (9-4) of the DSP56300 Family Manual (http://e- www.motorola.com/brdata/PDFDB/docs/DSP56300FM.pdf): According to the family manual, though, it would appear that the BCLK pin does not exist on the 321, so you won't be able to use that signal. I would try hooking it up anyway, since they may have bonded that pin out internally and not documented that fact. In any event, the driver for that pin will not allow full speed operation, even if it is bonded out. The best bet would be to model your algorithm with the 303 and then move your code to the 321, as far as the internal versus external accesses go.

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